Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f04520cd06499b…

MALICIOUS

PDF

85.0 KB Created: 2021-06-30 11:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f7aa30bcd2e6fef4fe51d6826e3cb885 SHA-1: 3a80cfae078105cc17985412db377b240de4b03f SHA-256: c3f04520cd06499b27470aa30e8d9af7ad4d54b0c37aca8fdb2788f7ce6e5f3c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://afghansolar.com/userfiles/file/6260855605.pdf In PDF document text
    • https://workinhotel.com/upload/fckfile/3363808794.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080762f9ca7c---popixutisidivunot.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/relokewisoji.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e73ef323ea---kadejurupekufiwilodawaw.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/fomapixomogubimana.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/pekirumopu.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/13393637476.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/fdf3d9d843d9a97945aeb2325c9df8f1/duwek.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/235c320dc559fa140e926d9a08bf55d0/fikutimexosuzare.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d018bca637---38156199516.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddecb71536---powimalejufixatanejozegaz.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2a4a081cd---batizezu.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/vuko035qpmgpl5bpak1o83hjm5/90743244156.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5e7aca30c---239371641.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/13a7526ae68a39794173261413af0b8e/98202861752.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/62569123619.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/gmgt5cd7gnkvn89037f7lvtap0/wejukiremojobinibat.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096b042937de---nibowaxogofowefe.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/6dvafqk23vueg18cu8i4o4c133/86124409032.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/22748852069.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/rusosi.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/64614278061.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/a3fc08028ca5f5df5a9793340d56fd66/noduwube.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3b93a8a4c92c17d4ef358cbdba9f1232/jewejibajazeziv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=luther+95+thesePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A9 10040 bytes
SHA-256: 3773514a973c7c42b18eada998a5ac215c3babd89ea95977a05504dad4403ac6
font_02_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 16528 bytes
SHA-256: db479492cfc126c7f462228f9b4da21b412fa2eb9e15f1f35ede8724347d2233

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